Celtic empire

This novel sends his intrepid heroes Dirk Pitt and Al Giordino on their wildest, boldest mission into the ancient world, unlocking extraordinary secrets and solving hideous crimes. The murders of a team of United Nations scientists in El Salvador. A deadly collision in the waterways off the city of Detroit. An attack by tomb raiders on an archaeological site along the banks of the Nile. Is there a link between these violent events? The answer may...